Comments for the methods were added

src/main/java/ntnu/idatt2016/v233/SmartMat/controller/group/GroupController.java

@@ -72,18 +72,32 @@ public class GroupController {
                 .map(group -> ResponseEntity.ok(group.getLevel()))
                 .orElseGet(() -> ResponseEntity.notFound().build());
     }
-
+    /**
+     * Sets the level of the group identified by the given ID to the level corresponding to the given experience points.
+     * Returns a ResponseEntity containing the new level of the group, or a 404 Not Found response if no Group with the given ID was found.
+     *
+     * @param groupId the ID of the group to update
+     * @param exp     the new experience points of the group
+     * @return a ResponseEntity containing the new level of the group, or a 404 Not Found response if no Group with the given ID was found
+     */
     @PutMapping("/group/{groupId}/newLevel/{exp}")
-    public ResponseEntity<Long> setNewLevel(@PathVariable("groupId") long groupId, @PathVariable("exp") long exp){
-        return groupService.setLevelByGroupId(groupId,exp)
+    public ResponseEntity<Long> setNewLevel(@PathVariable("groupId") long groupId, @PathVariable("exp") long exp) {
+        return groupService.setLevelByGroupId(groupId, exp)
                 .map(group -> ResponseEntity.ok(group.getLevel()))
-                .orElseGet(()->ResponseEntity.notFound().build());
+                .orElseGet(() -> ResponseEntity.notFound().build());
     }
 
+    /**
+     * Returns the progress of the level for the group identified by the given ID.
+     * Returns a ResponseEntity containing the progress of the current level as a percentage, or a 404 Not Found response if no Group with the given ID was found.
+     *
+     * @param groupId the ID of the group to query
+     * @return a ResponseEntity containing the progress of the current level as a percentage, or a 404 Not Found response if no Group with the given ID was found
+     */
     @GetMapping("/group/{groupId}/progress")
-    public ResponseEntity<Integer> getProgressOfLevel(@PathVariable("groupId") long groupId){
+    public ResponseEntity<Integer> getProgressOfLevel(@PathVariable("groupId") long groupId) {
         return groupService.getProgressOfLevel(groupId)
                 .map(ResponseEntity::ok)
-                .orElseGet(()->ResponseEntity.notFound().build());
+                .orElseGet(() -> ResponseEntity.notFound().build());
     }
 }

src/main/java/ntnu/idatt2016/v233/SmartMat/repository/group/GroupRepository.java

@@ -41,5 +41,10 @@ public interface GroupRepository extends JpaRepository<Group, Long> {
      */
     Optional<Long> getLevelByGroupId(long id);
 
+    /**
+     * Finds a group by group id
+     * @param id the id of the group
+     * @return the group with the given id if it exists
+     */
     Optional<Group> findByGroupId(long id);
 }

src/main/java/ntnu/idatt2016/v233/SmartMat/service/group/GroupService.java

@@ -65,9 +65,16 @@ public class GroupService {
         return groupRepository.getLevelByGroupId(id);
     }
 
-    public Optional<Group> setLevelByGroupId(long id, long exp){
+    /**
+     * Sets the level of the group identified by the given ID to the level corresponding to the given experience points.
+     *
+     * @param id  the ID of the group to update
+     * @param exp the new experience points of the group
+     * @return an Optional containing the updated Group, or an empty Optional if no Group with the given ID was found
+     */
+    public Optional<Group> setLevelByGroupId(long id, long exp) {
         Optional<Group> answer = groupRepository.findByGroupId(id);
-        if(answer.isPresent()){
+        if (answer.isPresent()) {
             Group realGroup = answer.get();
             realGroup.setPoints(exp);
             realGroup.setLevel(LevelUtil.getLevel(exp));
@@ -76,9 +83,15 @@ public class GroupService {
         return Optional.empty();
     }
 
-    public Optional<Integer> getProgressOfLevel(long id){
+    /**
+     * Returns the progress of the level for the group identified by the given ID.
+     *
+     * @param id the ID of the group to query
+     * @return an Optional containing the progress of the current level as a percentage, or an empty Optional if no Group with the given ID was found
+     */
+    public Optional<Integer> getProgressOfLevel(long id) {
         Optional<Group> answer = groupRepository.findByGroupId(id);
-        if(answer.isPresent()){
+        if (answer.isPresent()) {
             Group realGroup = answer.get();
             return Optional.of(LevelUtil.getProgressOfLevel(realGroup.getPoints()));
         }